A simple one-click app that displays the Specific Absorption Rate of your phone.
The maximum permissible Specific Absorption Rate of phones in most countries is 1.6-2.0 W/kg, while ideally a phone's SAR value should be around 0.6-0.8 W/kg. Anything above that should be taken as a serious concern.
This app displays the regulatory information of your phone containing the SAR values so it may not work with phones of which the manufacturer has not provided any regulatory information of (which is another reason for alarm).